Sample Code and Protected Presentation

Summary:

The document outlines a Java plugin development opportunity for the correlation engine to enhance event processing capabilities by running within memory and processing events with custom Java code. Amit Khandekar provides a link for detailed information on implementing this plugin, along with sample code and a PowerPoint presentation that might be useful. The provided code snippet is part of a larger Java class designed to handle security events, initializing managers (`ZoneExtensionManager` and `DomainExtManager`) and checking if an event name equals "Hello" before setting a custom string field in the `DomainExtManager`. The initialization methods are thread-safe using synchronized blocks, while errors during these processes print appropriate error messages. The email thread referencing this code snippet suggests following up on a missed opportunity for utilizing a valuable Java plugin. However, without full context of the email thread, it's unclear what specific action or consideration is being referred to.

Details:

Dear Emrah, I hope this message finds you well. I'm reaching out to inform you that yesterday I missed an opportunity to utilize a valuable Java plugin for the correlation engine, which could significantly enhance our event processing capabilities. This plugin is designed to run within memory and process events by executing custom Java code. For more detailed information on how to implement this plugin, please refer to the following link:

(https://irock.arcsight.com/blogs/content/2012/02/29/creating-an-esm-plugin) Additionally, I have included some sample code and a protected PowerPoint presentation that might be useful for your understanding of the plugin implementation. These resources can provide you with practical examples and insights into how to build and integrate Java plugins on the correlation engine. Best regards, Amit Khandekar Mobile: +1 647 533 2410 Email: amit.khandekar@hp.com The code snippet provided is part of a larger Java class that appears to be handling security events and performing operations based on those events. Specifically, it involves initializing managers (`ZoneExtensionManager` and `DomainExtManager`) and checking if an event name equals "Hello" before setting a custom string field in the `DomainExtManager`. Here's a summary of what happens when this code is executed: 1. **Initialization**: The class has methods to ensure that both `ZoneExtensionManager` (referred to as `zem`) and `DomainExtManager` (referred to as `dem`) are initialized properly, even if they were not instantiated during the regular course of execution. This is done in a thread-safe manner using synchronized blocks to avoid potential race conditions. 2. **Event Handling**: When an event list is passed to the class via the `onPrePersist` method, it checks each event within the list. If an event's name equals "Hello", it attempts to set a custom string field in the `DomainExtManager` using the value from the event. 3. **Error Handling**: If initialization of either manager fails or if setting the field fails due to some other reason, appropriate error messages are printed to standard error (`System.err`), indicating that an operation did not succeed as expected. The email thread in which this code snippet is referenced suggests a follow-up from Amit Khandekar mentioning an important option that was potentially missed yesterday. However, without the full context of the email thread, it's unclear what specific action or consideration this refers to. The summary is that Amit Khandekar has developed a Java plugin for an ArcSight correlation engine that aims to enrich firewall base events with username information from Active Directory (AD) logs. Emrah Alpa appreciates the detailed response and confirms that the solution works well, although there was an issue where they couldn't revert the rule back to its original state after making changes. The process involves creating two rules, one list, and a variable in the Java plugin for effective implementation. To summarize the provided information, here's a breakdown of the tasks and methods described: ### Task Overview: You need to populate a list with IP addresses and usernames from Active Directory (AD) logs and use this list to enrich username details in every firewall base event based on IP address matches. ### Methodology: 1. **Lightweight Rule for Populating the List:**

• Use a Lightweight rule, as it is recommended and supported in Express 4 and ESM 6.5.

• This rule will not generate a correlation event but logs any failures.

• It is faster than standard rules and has a performance gain due to fewer conditions (one event condition) and fixed aggregation at 1.

2. **Enriching Username in Firewall Base Events:**

• Based on the IP address match in the firewall event, enrich the base event using pre-persistence rules if possible (supported only in ESM 6.5).

• Pre-persistence rules are processed early and set values for incoming events before they are persisted. These values can be used by both standard and Lightweight rules during post-persistence event flow.

• Alternatively, use a Standard rule with variables to enrich the base event if using Express or another method if not applicable (like external mapping files).

• Using pre-persistence is preferred due to its direct applicability in the workflow for setting values before persistence.

### Technical Details:

• **Lightweight Rule:** Single event condition, triggered on every match, with aggregation fixed at 1. It does not generate a correlation event but logs rule failures.

• **Pre-persistence Rules (ESM 6.5 only):** Set values early in the workflow and are available to all rules during post-persistence. Cannot be scheduled or replayed as they cannot modify past events.

• **Standard Rule:** Only used for correlation alerts, enriching them but not base events directly since they are already persisted.

### Notes:

• For high EPS (Event Per Second), standard rules might automatically deactivate due to performance concerns; they will reactivate after a few minutes if the situation improves.

• External mapping via SQL statements is an option for low EPS scenarios or when other methods are not feasible, but it's less preferred and may have limitations.

### Conclusion: The most efficient approach seems to be using Pre-persistence rules in ESM 6.5 due to its direct applicability and support for setting values before events are persisted. This method leverages the specific capabilities of that version while avoiding potential performance issues with standard rules under high load conditions. Amit Khandekar shares a helpful resource and expresses hope that it will be beneficial for you. He also provides his contact information in case further assistance is needed, including his mobile number (+1 647 533 2410) and email address (amit.khandekar@hp.com).

Disclaimer:

The content in this post is for informational and educational purposes only. It may reference technologies, configurations, or products that are outdated or no longer supported. If there are any comments or feedback, kindly leave a message and will be responded.